If you mean legally, then I would imagine it would depend on if you had children with the drug using spouse.
If you do, it would be best to notify the police or contact an attorney. You have a responsibility to keep the children safe, and keeping them in a place where one parent is using drugs is not safe.
If not, then all you would have to do is pack and leave.
See information in the related link below, which provides information on leaving an abuser, as well as how to protect yourself and your children.
Impossible to answer without knowing who "HE" is.
You can Leave your spouse with out him being able to claim you deserted him if your spouse beat you or was unfaithful but you also have to be able to prove it.
blindfold. quickly then leave
It is possible but a normal person with sense would leave them.
Who cares. They sure don't.
The leave your spouse takes just after having a baby is called maternity leave.
The victim has no power or they would not be abused. The abuser always has the control. Children and the elderly are victimized often in society as well as men and women. The abuser will start out by abusing psychologically and 'put down' their victim until they leave their victim confused with no self confidence. The abuser may threaten to leave their victim (this is terrifying to the elderly); leave the wife and take the children; talk of killing the victim or anyone that is close to them. The abuser often isolates their victim so their victim has no family or friends to turn too and they have to suffer in silence and depend on their abuser.
If the grandmother has custody
Not likely. Generally the MO is they do everything but leave & the abused must be the one who escapes.
Call the cops and tell them to come and get him/her. Tell them what they are doing to you.
Yes. A person can devise their sole property by will in most jurisdictions. A husband does not need his wife's consent to leave his antique car to his brother. A wife doesn't need her husband's consent to leave her solely owned mountain cabin to her sister. However, one spouse cannot completely disinherit the other in most states except Louisiana and one spouse cannot leave property owned by survivorship to any third party.